Gemstone



FIG. 1 is a top plan view of a gemstone showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a right side view thereof, the left side, front and rear views being identical;

FIG. 4 is a perspective view of the top thereof; and,

FIG. 5 is a perspective view of the bottom thereof. 

CLAIM The ornamental design for a gemstone, as shown and described. 